Tube-bending machine.



J. F. HANSEN.

TUBE BENDING MACHINE.

APPLICATION m50 AuG.19, |915.

Patented Apr. 2, 1918.

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TUBE BENDING MACHINE.

APPLICAHON HLED AUG.19.1915.

Patented Apr. 2, 1918.

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l will IS, ASS-IGN'OR T0 THE DOLL S'VD'G t Q u or YoUNGsToWN, oHIo, A conrona'rron or oHIo.

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To all io'wmfz't concern.'

'Be it lmown that l, JULIUs F. HANSEN, a

citizen of the United States, resi at Evanston, in the county of Cook and tate fr of Illinois, haveinvented certain new and luseful Improvements in Tube-Bending Mahines; and l do. hereby declarethe follow-V lng to be a full, clear, and exactdescription of.y the invention, such as will enable others make and use the same.

skilled'in the art to which it appertains to invention relates to machinery for bem i 3 tubing and more especially for the bending of metal pipes or tubes.

@ne of the objects ofmy invention is to improve the machine illustrated in the application of Charles Vallone, No. 7578, series of 1915, led Feb-11th, 1915, by providing more facile, convenient economicalI means for preventing disfiguration of the tubing in bending. Y

This and other obects of my invention probably be Vbetterunderstood from a description of an embodiment of the invention.

Fie 1 of the drawing shows a plan view of a machine embodying my 1nvention,

ber 10in the embodiment illustrated.

llnes 0 2 073, 0 4 and 0 5.

Fig. 'shows the embodimentillustrated vin Fig. 1 with the' bending members in posi.- tion after the wheel has been turned through the desired angle. -v

Refe now to the drawing, and to the embodiment illustrated therein at 9 is shown a base supporting the mechanism for bend-` ing the tube. At 10 is shown a tube bendmember, preferably havin va curved surface of whatever character eslred, and here shown as a circular wheel. ber 10 is mounted upon a shaft 11 su po Mv vertically in the frame in anysnitab e manner, the wheel being fastened to the shaft by any suitable means, which may include a nut 12. The tube is bent about the memld rovided for transmitting f1.1 member 10 to at e same.v

the www? ent of my invention illustra,

this means includes a guiar. wheel 13, which is mouted upon shaft 11 and rigo 'a a new i S11ecllicaticu of Letters Patent.

Figs. 2, 3, l, and 5 are sections upon the'- `mountedin the interior which the tube is bent. The s ecial form and easily erformed. The mem- 1 1n trated over, is preferably made separate from the `'other parte, 1n order that -it- Ymay vided with a worm gear 15, which engages teeth upon the gear wheel 13. The shaft lll 1s mounted in any suitable manner in the ame, such as in a bearin 16. A A gear wheel 17 is mounted upon the shaft 14, which meshes with a secondv gear wheellS upon a third. shaft 19 mounted in the frame' in any suitable manner-,such as in bearings 20. A pulley 21 is mounted upon the shaft 19. rlhe pulley is driven, for example, through or other prime mover. The rim of the'bend1 ing wheel 10 is provided with a groove22, cut in the periphery thereof, leaving flanges 23 at the sides of the groove. This groove should be cut to ft the contour of the outer ysurface of the tube which is to be bent.

In the form illustrated, the arranged for the bendin of cylindrical tubing. The grooves wou d, therefore, be

' semi-cylindrical 1n section on planes taken `through the Vlong axis ofthe apparatus is also arranged-for bending the tube in some desired are of a circle, and therefore, the portion of the bendin wheel engaging the tube is'an arc of a circ e. The apparatus is also arranged 'to bend the tube through an arc'of ninety degrees. lt `will. be appreciated that the apparatus may be so arranged as to operate vupoutubes of any character and to bend them in any desired length and shape of arc, without departing from thes irit of the invention;

man rel 30 is provided, which is of the tube, and' over and shape of the mandrel itsel constitutes no art of my invention, though it is prefera le to employ some mandrelof suitable shape, such that bendin can be correctly e mandrel30 is provided wlth a nose 32 and a main portion 31. The mandrel is supported by some suitable supporting means, such as a rod 40 extending through the tubing connected in any suitable manner at 41l to the mandrel. Means are provided for grasping one sec-` tion of the tube, here' shown as a vpair of 1 43 may cp grips 42 and 43; e bef W.; with the bending w e. as illusthe drawing rl'he clamp 42, ho.w

be mov-or i Patented Apr. 2, 191%..

H Application tiled Augustw, 1915. Serial No. 46,233.

mechanism is the tube is to be inserted -or removed. The

' at each end of said are,

parts 42 and 43 may be provided with grooves44 and 45, respectively, of such contour that 4the tube is tightly gripped between the members 42 and 43. In the form shown the ooves in the members v42 and. 43 woul ofA course, be semi-cylmdrical in cross-section. Any suitable means may be provided for clamping the members 42 and 43 together, such as a bracket 46 and a clamping screw 47. Means are also provided for holding another section of this tube, Vbut preferably permitting l Y longitudinal movement thereof, the tube being'permitted to slide longitudinally when ent. 'I-his means consists of a follower 49,

vwhich lis positioned upon the frame'by any suitable means, in such a'manner as to conveniently perform its functions. The member 49 is provided with a oove 51 into which the tubefits, and in w ich it is positioned. The member 49-also serves as an anvil or backing'member when the lug 200 engages the tube.

When the tube vis bent, the follower 49 moves with the tube as it is drawn through the frame, the follower being held against .the tube by a clamping arrangement 52.. Means are provided for pressing out any deformities, such as kinks or other irregularities which appear in the under-side of the tubing at the conclusion of the bending movement. In the-form shown, this membervis formed by carrying the portion 222 of' the groove 22' from a lineally and in a direction tangential to the groove `.22. In other words, in the specific. vstructure of the embodiment illustrated, the

groove 22 in the wheel is of substantially the same arc as that desired to be given to the tube and the groove is extended rectilineally so asy to be tangential to the oove 22. In the embodiment r villustrated. t e tube iste be bent thmugh 90 I at andthe arc from the point 201 to the point 101 is 90.

' It will readily be appreciated that as the tube is bent,l there will be atendency for the inner .portion of the tubing to crimp or 50" .crease especially that portion which is not drawn into contact with the walls of the ve in the wheel. The part 200, however,

as shown in Fig. 6) engages this portion of the tube at the conclusion of the operation and edectively presses out any irregularities' in the walls of the tube between the bodylportion 31 of the mandrel and the part spring 90`isconnected at one end 91 to abracket 92 supported in the frame and at the other end 93 to a'hook 94 on the follower. This spring is expanded when the wheel is operated and acts to return the follower when it is released.

han on of my device be appoint 201 recti-v V Lemme being rotated,' the end of the tube engaged by the members 42 and 43 will be carried Y clockwise from the position shown in Figi to the position shown in Fig. 6, the tube being drawn over the wheel and bent over the wheel and mandrel, the member 49 following `the tube as it'is bent to the position shown in Fig. 6. Those portion's of the tube which passoverthe periphery of the wheel will be properly ironed out, so to speak, and at the conclusion of the 'operatiomthe part 200 will engage the outside of the surface of that portion of the tube adjacent the underside of the mandrel and press out any irregularities which have been caused .in thisv portion of thereof.

It will be understood that I have employed l these forms and these details for the purpose of illustrating my invention, and that I do not wish tobe limited thereto, as many variations may be made in the forms and details and many departures made from those illustrated in the drawing, without departing from the spirit of the invention.

I claim f 1. In a tube bending machine, the' combii nation of a bending wheel provided with a peripheral groove, a mandrel mounted concentric with the groove, there being space enough between the walls of the groove and the mandrel for the wall of the tube to be bent, a lug in the rear end of the groove inpn wheel attle eng of said groove, said ug elng provi e wit a ve tange nt. to the oove in the wheel, meriignism to'bend a tu about said wheel, and means within the tube against which the lug at the end of the stroke presses a portion of the tube eliminatin any irregularities therefrom.

3. a tube bending machine, the combination of .a bending wheel provided with a curved peripheral groove of substantially the same are as the angle to be given the tube to be bent and havinga cross-sedzional area substantially half the cross-sectional area of the tube to be bent, said wheel provided with a second and straight groove in its periphery of substantia the same crosssectional area as the first groove and tangential therewith, whereby a tube l j :g1g lug is formed said wheel at the i of the 4 the tube` by the bending iat stantially the same sectional v shape as the tube curved by the machine and eliminating bore ofthe tube to be bent, means to hold any irre lanties therein by vpres same the 'mandrel in the bore of the tube to be against t; mandrel and mechanism or op- 1e bent adjacent the Wheel, an anvil in said maerating said Wheel.

5 chine on the opposite side yof the mandrel In witness whereol have signed my name from the wheel, said lugl engaging a portion this 11th day` of August, 1915 of the tube at the end of the part of the v J. F. HANSEN. 

